The "Periodic Maintenance / Lubrication Intervals" schedule is taken directly from a 1981 edition Honda NC50/NA50 Express Factory Service Manual, which covers the '77 - '82 NC50 Express and the '79 - '81 NA50 Express II (other models should be similar). This maintenance schedule is based upon average riding conditions. Machines subjected so severe use, or ridden in unusually dusty areas, require more frequent servicing. Before starting any work, always consult the manual for your scooter's model & year and be sure you know what you're doing.

NA/NC50 Periodic Maintenance / Lubrication Intervals

I: Inspect    R: Replace    C: Clean    L: Lubricate   A: Adjust




Pre-Ride Inspection

Initial safety inspection
1 month or 200 mi (300 km)
Thereafter every
12 months or 1000 mi
(1500 km)

Thereafter every
24 months or 2000 mi (3000 km)
Tires and Tire Pressure  

18 psi Front, 32 psi Rear
Tires: 2.25-14





Contact Breaker Points*       I I  
Ignition Timing*       I I  
Throttle Operation Check and adjust free play as needed   I      
*Wheel trueness and spokes       I I  
*Nuts, Bolts (tighten) Tighten to proper torque as needed    




Brake Linings*   Front: DP9105, EBC301
Rear: DP9105, EBC302
Battery Fluid Level*   Distilled water I      
Battery Fluid Specific Gravity   6N4-2A-8     I  
Spark Plug* 0.6 - 0.7mm gap (0.024 - 0.028 in) NGK BP6HS     R  
Air filter element*       Change every 6 months


*Fuel Filter Screen       C C  
Front and rear suspension*        



Clutch Shoes*        



Transmission oil* The red circle in the pop-up picture is the 10mm drain bolt. The green circle is the 14mm check bolt. Fill through check bolt, until oil starts running out of the hole. About 900cc of 10W-30 oil   R   R
Decarbonize cylinder, cylinder head and muffler*           C
Brake Operation and Free Play    



Oil and Fuel Level     I      
All Lights and Horn    


Transmission case for leaks  






* These items should be serviced by an authorized Honda dealer, unless the owner has the proper tools, service data and mechanical knowledge to do the work.

Wiring diagram

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